#include <linux/unistd.h>#include <linux/module.h>#if defined(CONFIG_SMP)#define __SMP__#endif#if defined(CONFIG_MODVERSIONS)#define MODVERSIONS#endif#include <linux/sched.h>#include <linux/kernel.h>#include <linux/fs.h>#include <linux/errno.h>#include <linux/malloc.h>#include <linux/ioport.h>#include <linux/mm.h>#include <linux/interrupt.h>#include <linux/tqueue.h>#include <linux/timer.h>#include <linux/delay.h>#include <linux/types.h>#include <asm/io.h>#include <asm/segment.h>#include <asm/irq.h>#include <asm/signal.h>#include <asm/siginfo.h>#include <asm/uaccess.h>#include <asm/fcntl.h>#include <asm/cache.h>#include <asm/atomic.h>#include <sys/syscall.h>#include "sjacan.h"/*****************************變量聲明*****************************/unsigned int SJA_major = SJA_MAJOR;struct SJA_device *Device[SJA_NUM];unsigned int SJA_irq[SJA_NUM] = {6,6};//聲明中斷號unsigned int SJA_baudrate[SJA_NUM] = {40,40};//聲明波特率static char *SJA_name[SJA_NUM] = {"sjacan0","sjacan1"};//聲明注冊的設備的名稱/*****************************函數聲明*****************************/void SJA_interrupt(int ,void *,struct pt_regs *);void recv_bottom_half(void *);void timer_function(unsigned long);/*****************************SJA device initialize*************************/static int SJA_init(void){   int res,i;   res = check_region(SJA_CMD_PORT,3);   if(res < 0)        {       printk(KERN_ALERT"check SJA port failed.\n");       return res;        }    request_region(SJA_CMD_PORT,3,"SJACAN");    for(i=0;i<SJA_NUM;i++)          {       Device[i] = kmalloc(sizeof(struct SJA_device),GFP_KERNEL);       if(Device[i] == NULL)                  {          printk(KERN_ALERT"allocate device memory failed.\n");          return(-ENOMEM);                 }       memset(Device[i],0,sizeof(struct SJA_device));       Device[i]->RecvBuf = (unsigned char *)get_free_page(GFP_KERNEL);       if(Device[i]->RecvBuf == NULL)                   {          printk(KERN_ALERT"allocate Recv memory failed.\n");          return(-ENOMEM);                   }        memset(Device[i]->RecvBuf,0,BUFSIZ);        Device[i]->RecvHead = 0;        Device[i]->RecvTail = 0;        Device[i]->RecvNum = 0;        Device[i]->RecvQueue = NULL;        Device[i]->SendBuf = (unsigned char *)get_free_page(GFP_KERNEL);        if(Device[i]->SendBuf == NULL)                    {           printk(KERN_ALERT"allocate Send memory failed.\n");           return(-ENOMEM);                      }         memset(Device[i]->SendBuf,0,BUFSIZ);         Device[i]->recv_bottom_task = (struct tq_struct *)kmalloc(sizeof(struct tq_struct),GFP_KERNEL);//初始化任務隊列結構         if(Device[i]->recv_bottom_task == NULL)                        {            printk(KERN_ALERT"allocate bottom memory failed.\n");            return(-ENOMEM);                         }          memset(Device[i]->recv_bottom_task,0,sizeof(struct tq_struct));          Device[i]->recv_bottom_task->routine = recv_bottom_half;          /*recv_bottom_task->routine指向調用的函數 */          Device[i]->recv_bottom_task->data = (void *)Device[i];/*                         recv_bottom_task->data指向傳遞的參數 */          Device[i]->timer = (struct timer_list *)kmalloc(sizeof(struct timer_list),GFP_KERNEL);/*           初始化timer_list結構 */          if(Device[i]->timer == NULL)                          {             printk(KERN_ALERT"allocate timer memory failed.\n");             return(-ENOMEM);                           }           Device[i]->timer->data = 0;           Device[i]->timer->function = timer_function;           Device[i]->timer->expires = 0;           Device[i]->TimerCount = 0;           init_timer(Device[i]->timer);           Device[i]->PortNum = i;           Device[i]->FrameMode = 1;           Device[i]->IrqNum = SJA_irq[i];           Device[i]->BaudRate = SJA_baudrate[i];                            }   return 0;}/*****************************Function bottom interrupt********************/void recv_bottom_half(void *device){}/*****************************Function interrupt****************************/void SJA_interrupt(int irq,void *dev_id,struct pt_regs *regs){}/*****************************打開SJACAN**********************************/int SJA_open(struct inode *inode,struct file *filp){   int res;   int PortNum;   struct SJA_device *dev;   PortNum = MINOR(inode->i_rdev);   if(PortNum > SJA_NUM) return(-ENODEV);   dev = Device[PortNum];   if((filp->f_flags & O_ACCMODE) == O_WRONLY)       {}    else        {     if(dev->ref_count == 0)              {        res = request_irq(dev->IrqNum, SJA_interrupt,SA_SHIRQ | SA_INTERRUPT,SJA_name[dev->PortNum],dev);        if(res < 0)                      {           printk(KERN_ALERT"can't request irq %i.\n",dev->IrqNum);           return res;                       }         printk(KERN_ALERT"request irq %i success.\n",dev->IrqNum);                       /*************************初始化 SJACAN，寫入一些配置參數************************/         if(dev->FrameMode)         SJA_WRITE(0x01,SJA_MODE,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0x00,SJA_MODE,(SJA1_DAT_PORT+PortNum));                         SJA_WRITE(0x01,SJA_ACR0,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_ACR1,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0x02,SJA_ACR2,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_ACR3,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_AMR0,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_AMR1,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_AMR2,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_AMR3,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0x07,SJA_BTR0,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0xff,SJA_BTR1,(SJA1_DAT_PORT+PortNum));/*設置波特率為40k*/         SJA_WRITE(0x1a,SJA_OCR,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0x01,SJA_IE,(SJA1_DAT_PORT+PortNum));         SJA_WRITE(0x00,SJA_MODE,(SJA1_DAT_PORT+PortNum));              }      dev->ref_count++;        }   filp->private_data = dev;    /*MOD_INC_USE_COUNT; */   return 0;}/*****************************Functin SJA_release**************************/int SJA_release(struct inode *inode,struct file *filp){   struct SJA_device *dev = filp->private_data;   if((filp->f_flags & O_ACCMODE) != O_WRONLY)         {      if(--dev->ref_count == 0)                {          free_irq(dev->IrqNum,dev);          SJA_WRITE(0x00,SJA_IE,(SJA1_DAT_PORT+dev->PortNum));                }        }/*         MOD_DEC_USE_COUNT; */   return 0;}/*****************************Function timer*******************************/void timer_function(unsigned long ptr){}/*****************************File operations define************************/struct file_operations SJA_fops = {    NULL,     
    NULL,    //read    NULL,    //write    NULL,      
    NULL,    //EMM_poll,    NULL,    //ioctl    NULL,       
    SJA_open,    //open    NULL,
    SJA_release,    //release    NULL,        
    NULL,    NULL,
    NULL,
    NULL     
};
/****************************Module initialize******************************/int init_module(void){   int res;   EXPORT_NO_SYMBOLS;   res = register_chrdev(SJA_major,"SJACAN",&SJA_fops);   if(res < 0)         {      printk(KERN_ALERT"device register failed.\n");      return res;        }   if(SJA_major == 0) SJA_major = res;   if(SJA_init() < 0) printk(KERN_ALERT"SJA device initializition failed.\n");   else printk(KERN_ALERT"SJACAN initializition success.\n");   return 0;}/****************************Module release********************************/void cleanup_module(void){   unregister_chrdev(SJA_major,"SJACAN");   release_region(SJA_CMD_PORT,3);   printk(KERN_ALERT"SJACAN release success.\n");}